You can take a look here http://en.wikipedia.org/wiki/Utility_frequency It may give some answers. Unless noted you should assume that AC voltages are given in RMS. And that is also the value that common voltmeters will show. As an aside. Most voltmeters are only good for measuring pure sine wave AC up to around 500 Hz.

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“Electrical science has disclosed to us the more intimate relation existing between widely different forces and phenomena and has thus led us to a more complete comprehension of Nature and its many manifestations to our senses.”